In order to avoid the temperature cross-sensitivity during refractive index measurement, a sensor based on a superimposed long period gratings fabricated in few mode fiber was proposed. The superimposed long period grating was ins

The performance degradation of fiber Bragg grating strain sensors is unavoidable under stress fatigue, in order to assess the ultimate sensing life of fiber Bragg grating sensors, the full scale relative error expression of stress

The fabrication mechanism of Long-Period Fiber Gratings(LPFGs) in standard SMF-28 telecommunication fibers without hydrogen loading were explored by using direct writing method based on femtosecond laser pulses, with pulse duratio

Three dimensional deformation field of the dumbbell shaped specimen surface is obtained by color digital holographic system. The young′s modulus of TC4 titanium alloy is calculated by the three dimensional deformation field in the

In order to correct phase aberrations in the digital holographic microscopy measurement system, a numerical method combined with physical method, namely reference lens method is applied in off-axis digital holographic microscopy s

A new method for geometric features extraction of ship target in high-resolution Synthetic Aperture Radar (SAR) image was proposed, After detecting and locating ship targets from high-resolution SAR images. The algorithm continues

To solve the inaccurate problem of global motion estimation due to local motion in video stabilization, a real-time stabilization method was proposed. The method proposes an approach of feature points iterative filtering algorithm

In order to improve the calibration reliability of laser 3D projection calibration system and to obtain the best calibration parameters, according to the basic principle of the system, a method is proposed to combine the laser 3D

In order to avoid the influence of the interference noise introduced by the front and rear surfaces while measuring the parallel plate, an absolute measurement method for the optical homogeneity was proposed based on the principle

Giant Steerable Science Mirror (GSSM) is largest flat mirror as the tertiary mirror of Thirty Meter Telescope (TMT).To evaluate the performance of GSSM under gravity load, the mirror figure needs to be tested. Erorr analysis is th

High stability mode-locked fiber laser whose key is to obtain a stable mode-locked pulse output has broad applications in the optical frequency comb, micro-processing and other fields. In this paper, chirped fiber Bragg grating, a

A compact laser-induced breakdown spectroscopy using a low-energy, high-repetition rate Nd: YAG DPSS laser as excitation source has been developed. The influences of laser repetition rate and laser power on LIBS signal were analyz

A widely tunable narrow-linewidth photonic microwave generation scheme based on the period-one dynamics of an optically injected semiconductor laser combined with optoelectronic loops is proposed and experimentally demonstrated. T

A series of double-axis flexible support structure is put forward to ensure the surface figure and stability of the miniature space camera ultra-light reflectors. Taking the ultra-light mirror surface under multiple operating cond

An aspherical zoom optical system is designed to solve the problems of adjustment of internal and external coherence factors, lack of energy utilization and short life of module of NA 1.35 immersion lithography system. This zoom o

A method is proposed for improving the stability of an Optoelectronic Oscillator (OEO) based on self-phase-locked technique. The output frequency stability of the OEO is improved by controlling an Optical Tunalble Delay Line (OTDL

One-dimensional (1D) photonic crystal structure model was theoretically analyzed through analytical expressions with various structural parameters. The bandgap characteristics of the 1D photonic crystal resulting from the structur

In order to explore the relationship between single crystal sapphire subsurface damage depth and polishing parameters of cluster magnetorheological finishing, a relationship model of the subsurface damage depth and the polishing p

Based on the theory of Surface plasmon polaritons, a plasmonic structure consisting of a metal-insulator-metal waveguide and a semi-ring stub was proposed to investigate the transmission properties by the finite-difference time-do

A single photon avalanche diode with non-contact guard ring was proposed based on standard CMOS technology. The influences of the guard ring's spacing on the electric field distribution and the avalanche probability of the device

The wavelength/temperature coefficient of AlGaInAs MQWs FP laser devices are measured by analyzing the wavelength changed with ambient temperature at the same heating power. Also, the wavelength of device changed with heating powe

Compared to traditional RSOA, the reflective quantum dot semiconductor optical amplifier (R-QDSOA) has the picosecond carrier recovery rate and the modulation bandwidth of dozens of GHz. It is reveal that R-QDSOA has a great appli

The achromatic characteristic of polarization modulation module- double combo wedges modulator was studied, in order to improve the sampling accuracy of spectral polarization data and image in spatial modulating spectropolarimetry

A method for generating hybridly polarized vector beams by manipulating Pancharatnam-Berry (PB) phase is proposed. According to the law of optical axis varying with the spatial coordinates, a PB phase element is used to manipulate

It is difficult to measure the particle size distribution for multi-modal particle system in dynamic light scattering technique, because of the ill posed problem in the data inversion. In this paper, the smooth constraint penalty

In order to study the propagation of near infrared light in the skin tissue, the human skin tissue model was established, including absorption coefficient, scattering coefficient, refractive index and anisotropy factor of epidermi

For the measurement of a single drop in spray, the Debye series for scattering of a Gaussian beam by a spherical drop is used to study the light intensity distribution in the primary rainbow region and the influence of the Gaussia

Photometric data of satellites are related to many factors, such as satellite attitude, material and observation angle. The simulation calculation is often unable to obtain these factors, so that the simulation results cannot be c

Based on the visual attention mechanism, a large number of subjective experiments were conducted to quantitatively study the chromaticity factors that affect the visual comfort of stereo images. First, the stereo salient map was o